What three things happen when air is warmed?

it expands

it contracts

it becomes lighter

it becomes heavier

it rises

it sinks

A 2000kg coaster is released 40 meters above the ground on a frictionless track. What is the approximate speed at ground level?

The end of a stopped pipe is to be cut off so that the pipe will be open. If the stopped pipe has a total length L, what fraction of L should be cut off so that the fundamental mode of the resulting open pipe has the same frequency as the fifth

A closed loop conductor with radius 2.0 m is located in a changing magnetic field. If the maximum emf induced in the loop is 2.

A basketball rolls to a stop along a gym floor without anyone touching it. What answer choice BEST explains why this occurred?

What is the SI Unit for speed (or velocity) of a wave?

An open-topped freight car with mass 24,000 kg is coasting without friction along a level track. It is raining very hard, and the rain is falling vertically downward. Originally, the car is empty and moving with a speed of 4.00 m/s.

Photons travel outward from a light bulb in

The critical angle for a beam of light passing from water into air is 48.8°. this means that all light rays with an angle of incidence in the water that is greater than 48.8° will be

A basketball is filled with air and has a small hole. Explain why the basketball would leak.

Aligned magnetic domains are only present in which of the following? A) permanent magnets B) temporary magnets C) all magnetic material D) depends on the situation